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It seems like it wouldn't be much more code to just use an AJAX POST for the hash and have the server reply whether it has the hash or not, followed by the chunk upload again over AJAX. It would probably be slower and less data efficient, but I don't see how it would be much more code.

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The whole point of uploading a file this way is that it is more data efficient and faster in my use case.

That means that slowness is a bug; inefficiency is a bug.

For what reason would you put bugs in your code on purpose?

We also probably have different ideas about how much "much" is.

Perhaps it would require more code to get it equally fast and data efficient :)

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